I cannot enter my password when using sudo to install Sophos AV for Linux

Posted by dycharlie on Ask Ubuntu See other posts from Ask Ubuntu or by dycharlie
Published on 2012-05-07T02:06:05Z Indexed on 2013/06/25 4:29 UTC
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I cannot type my password as shown below. After successfully unlocking root account in Ubuntu 12.04 LTS.

saintmichael@ubuntu:~$ sudo 
usage: sudo [-D level] -h | -K | -k | -V
usage: sudo -v [-AknS] [-D level] [-g groupname|#gid] [-p prompt] [-u user
            name|#uid]
usage: sudo -l[l] [-AknS] [-D level] [-g groupname|#gid] [-p prompt] [-U user
            name] [-u user name|#uid] [-g groupname|#gid] [command]
usage: sudo [-AbEHknPS] [-C fd] [-D level] [-g groupname|#gid] [-p prompt] [-u
            user name|#uid] [-g groupname|#gid] [VAR=value] [-i|-s] [<command>]
usage: sudo -e [-AknS] [-C fd] [-D level] [-g groupname|#gid] [-p prompt] [-u
            user name|#uid] file ...
saintmichael@ubuntu:~$ sudo ./sophos-av/install.sh
[sudo] password for saintmichael: 

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